Fsc part 2 online preparation for chemistry chapter 3 (group IIIA and Group IVA Elements)

Online Short Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

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Chemistry - 12th Class Chemistry Chapter 3 Short Questions Preparation

Question # 1

In which way Al becomes water soluble by using NaOH?

  • Ans 1: Aluminium dissolves in sodium hydroxide to form a soluble aluminate,with the evolution of hydrogen.
    2Al(s)+ 2NaOH(aq)+ 6H2O(I)---->2NaAI(OH)4(aq)+ 3H2(g)
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

12th Class Chemistry Chapter 3 Short Questions Preparation - Set 1

Question # 1

In which way Al becomes water soluble by using NaOH?

  • Ans 1: Aluminium dissolves in sodium hydroxide to form a soluble aluminate,with the evolution of hydrogen.
    2Al(s)+ 2NaOH(aq)+ 6H2O(I)---->2NaAI(OH)4(aq)+ 3H2(g)
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 2

Question # 1

Write two uses of silicons.

  • Ans 1: i) They are used in hydraulic brakes and other hydraulic system.
  • Ans 2: ii) Methyl silicones of high molecular mass resembles rubber and are used in making rubber like tubbing and sheets.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 3

Question # 1

Write the behavior of Al with conc. HNO3

  • Ans 1: Aluminium does not react with nitric acid at any concentration,probably because of the formation of protective layer of aluminium oxide.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 4

Question # 1

Borate glazes are better than silicate glazes.Explain?

  • Ans 1: Boric acid is used in pottery as a glaze because glazes are more fusible than silicate glazes and possess a higher coefficient of expansion.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 5

Question # 1

How borax is commercially prepared?Give two methods of preparation.

  • Ans 1: i) Borax is prepared by treating a hot solution of boric acid with proper amount of soda ash:
    4H3BO3+ Na2CO3--------> Na2B4O7+ 6H2O + CO2
  • Ans 2: ii) Borax is almost exclusively obtained from calcium borate.Finely
    powderedcolemanite is boiled with Na2CO3solution.When CaCO3precipitates out and a mixture of borax and sodium metaborate is formed.
    4Ca2B6O11+ 2Na2CO3------->2CaCO3+ Na2B4O7+ 2NaBO2
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12th Class Chemistry Chapter 3 Preparation

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